/**
 * ULTRA-PREMIUM DESIGN SYSTEM
 * Power of Knowledge - World-Class AI Academic Journal
 * Version 2.0 - Quantum Twilight Theme
 */

/* ============================================
   PART 1: CSS CUSTOM PROPERTIES (VARIABLES)
   ============================================ */

:root {
    /* PRIMARY: Deep Space Authority */
    --void-black: #0a0a0f;
    --obsidian: #12121a;
    --anthracite: #1a1a2e;
    --graphite: #252540;
    --slate-dark: #2d2d4a;

    /* SECONDARY: Electric Knowledge */
    --quantum-blue: #00d4ff;
    --quantum-blue-rgb: 0, 212, 255;
    --neural-purple: #8b5cf6;
    --neural-purple-rgb: 139, 92, 246;
    --synapse-pink: #ec4899;
    --plasma-green: #10b981;
    --amber-glow: #f59e0b;

    /* METALLICS: Premium Signals */
    --platinum: #e5e7eb;
    --silver: #9ca3af;
    --gold-standard: #fbbf24;
    --rose-gold: #f472b6;

    /* GRADIENTS */
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #ec4899 100%);
    --gradient-ai: linear-gradient(90deg, #00d4ff 0%, #8b5cf6 100%);
    --gradient-premium: linear-gradient(135deg, #fbbf24 0%, #f59e0b 50%, #d97706 100%);
    --gradient-dark: linear-gradient(180deg, #0a0a0f 0%, #1a1a2e 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    --gradient-border: linear-gradient(135deg, rgba(0, 212, 255, 0.5), rgba(139, 92, 246, 0.5));
    --gradient-cta: linear-gradient(135deg, #00d4ff 0%, #667eea 100%);

    /* TYPOGRAPHY */
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --font-serif: 'Literata', Georgia, serif;

    /* TYPE SCALE */
    --text-hero: clamp(3rem, 8vw, 5rem);
    --text-display: clamp(2rem, 5vw, 3rem);
    --text-h1: clamp(1.75rem, 4vw, 2.25rem);
    --text-h2: 1.5rem;
    --text-h3: 1.25rem;
    --text-body: 1rem;
    --text-small: 0.875rem;
    --text-micro: 0.75rem;

    /* SPACING */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* BORDERS & RADIUS */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* SHADOWS */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.3);
    --shadow-glow-purple: 0 0 40px rgba(139, 92, 246, 0.3);

    /* TRANSITIONS */
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --ease-elastic: cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --duration-fast: 150ms;
    --duration-normal: 300ms;
    --duration-slow: 500ms;
    --transition-base: all var(--duration-normal) var(--ease-smooth);
}

/* ============================================
   PART 2: BASE RESETS & DARK THEME
   ============================================ */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    /* scroll-behavior: smooth; REMOVED for Lenis compatibility */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.ultra-premium {
    margin: 0;
    padding: 0;
    font-family: var(--font-body);
    font-size: var(--text-body);
    line-height: 1.6;
    color: var(--platinum);
    background: var(--void-black);
    min-height: 100vh;
}

/* ============================================
   PART 3: TYPOGRAPHY CLASSES
   ============================================ */

.up-text-hero {
    font-family: var(--font-display);
    font-size: var(--text-hero);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.up-text-display {
    font-family: var(--font-display);
    font-size: var(--text-display);
    font-weight: 600;
    line-height: 1.2;
    color: var(--platinum);
}

.up-text-h1 {
    font-size: var(--text-h1);
    font-weight: 700;
}

.up-text-h2 {
    font-size: var(--text-h2);
    font-weight: 600;
}

.up-text-h3 {
    font-size: var(--text-h3);
    font-weight: 600;
}

.up-text-body {
    font-size: var(--text-body);
}

.up-text-small {
    font-size: var(--text-small);
    color: var(--silver);
}

.up-text-micro {
    font-size: var(--text-micro);
    color: var(--silver);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.up-text-gradient {
    background: var(--gradient-ai);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.up-text-glow {
    text-shadow: 0 0 20px rgba(0, 212, 255, 0.5);
}

/* ============================================
   PART 4: GLASS CARD COMPONENTS
   ============================================ */

.up-glass-card {
    background: rgba(26, 26, 46, 0.7);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    transition: var(--transition-base);
}

.up-glass-card:hover {
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.up-glass-card-elevated {
    background: rgba(37, 37, 64, 0.85);
    backdrop-filter: blur(40px) saturate(200%);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-xl), inset 0 1px 1px rgba(255, 255, 255, 0.05);
}

.up-glass-card-gradient {
    position: relative;
    background: var(--anthracite);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
}

.up-glass-card-gradient::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-xl);
    padding: 1px;
    background: var(--gradient-border);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

/* ============================================
   PART 5: BUTTON SYSTEM
   ============================================ */

.up-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.75rem 1.5rem;
    font-family: var(--font-body);
    font-size: var(--text-small);
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.up-btn-primary {
    background: var(--gradient-cta);
    color: var(--void-black);
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.4);
}

.up-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 212, 255, 0.5);
}

.up-btn-primary::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(rgba(255, 255, 255, 0.2), transparent);
    opacity: 0;
    transition: opacity var(--duration-fast);
}

.up-btn-primary:hover::after {
    opacity: 1;
}

.up-btn-secondary {
    background: transparent;
    color: var(--platinum);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.up-btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
}

.up-btn-ghost {
    background: transparent;
    color: var(--quantum-blue);
    padding: 0.5rem 1rem;
}

.up-btn-ghost:hover {
    background: rgba(0, 212, 255, 0.1);
}

.up-btn-lg {
    padding: 1rem 2rem;
    font-size: var(--text-body);
    border-radius: var(--radius-lg);
}

.up-btn-sm {
    padding: 0.5rem 1rem;
    font-size: var(--text-micro);
}

/* Ripple Effect */
.up-btn-ripple {
    position: relative;
    overflow: hidden;
}

.up-btn-ripple::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.up-btn-ripple:active::before {
    width: 300px;
    height: 300px;
}

/* ============================================
   PART 6: AI COMPONENTS
   ============================================ */

.up-ai-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background: var(--gradient-ai);
    color: var(--void-black);
    font-size: var(--text-micro);
    font-weight: 700;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    box-shadow: 0 2px 10px rgba(0, 212, 255, 0.3);
}

.up-ai-badge svg,
.up-ai-badge i {
    width: 12px;
    height: 12px;
}

.up-ai-glow {
    animation: aiPulse 2s ease-in-out infinite;
}

@keyframes aiPulse {

    0%,
    100% {
        box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
    }

    50% {
        box-shadow: 0 0 40px rgba(0, 212, 255, 0.6);
    }
}

/* AI Tool Card */
.up-ai-tool-card {
    background: var(--anthracite);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    text-align: center;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.up-ai-tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-ai);
    opacity: 0;
    transition: opacity var(--duration-normal);
}

.up-ai-tool-card:hover {
    transform: translateY(-8px);
    border-color: var(--quantum-blue);
    box-shadow: var(--shadow-glow);
}

.up-ai-tool-card:hover::before {
    opacity: 1;
}

.up-ai-tool-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-lg);
    background: rgba(0, 212, 255, 0.1);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: var(--quantum-blue);
}

/* ============================================
   PART 7: STATS & METRICS
   ============================================ */

.up-stat-card {
    background: var(--anthracite);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    text-align: center;
}

.up-stat-value {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--platinum);
    line-height: 1;
    margin-bottom: var(--space-xs);
}

.up-stat-value.gradient {
    background: var(--gradient-ai);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.up-stat-label {
    font-size: var(--text-small);
    color: var(--silver);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.up-stat-change {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: var(--text-micro);
    margin-top: var(--space-sm);
    padding: 2px 8px;
    border-radius: var(--radius-full);
}

.up-stat-change.positive {
    background: rgba(16, 185, 129, 0.2);
    color: var(--plasma-green);
}

.up-stat-change.negative {
    background: rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

/* ============================================
   PART 8: HERO SECTION
   ============================================ */

.up-hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-3xl) var(--space-xl);
    overflow: hidden;
    background: var(--void-black);
}

.up-hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(102, 126, 234, 0.3), transparent),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(139, 92, 246, 0.2), transparent),
        radial-gradient(ellipse 50% 30% at 20% 80%, rgba(236, 72, 153, 0.15), transparent);
    z-index: 0;
}

.up-hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
}

.up-hero-subtitle {
    font-size: var(--text-h3);
    color: var(--silver);
    margin-bottom: var(--space-lg);
    opacity: 0.9;
}

.up-hero-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--space-2xl);
}

.up-hero-stats {
    display: flex;
    gap: var(--space-xl);
    justify-content: center;
    margin-top: var(--space-3xl);
    padding-top: var(--space-2xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.up-hero-stat {
    text-align: center;
}

.up-hero-stat-value {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--quantum-blue);
}

.up-hero-stat-label {
    font-size: var(--text-small);
    color: var(--silver);
    margin-top: var(--space-xs);
}

/* ============================================
   PART 9: NAVIGATION
   ============================================ */

.up-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-base);
}

.up-nav.scrolled {
    background: rgba(10, 10, 15, 0.95);
    box-shadow: var(--shadow-lg);
}

.up-nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-xl);
}

.up-nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
}

.up-nav-logo img {
    height: 40px;
    width: auto;
}

.up-nav-logo-text {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-ai);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.up-nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    list-style: none;
    margin: 0;
    padding: 0;
}

.up-nav-link {
    color: var(--silver);
    text-decoration: none;
    font-size: var(--text-small);
    font-weight: 500;
    transition: color var(--duration-fast);
    display: flex;
    align-items: center;
    gap: 6px;
}

.up-nav-link:hover {
    color: var(--platinum);
}

.up-nav-link.active {
    color: var(--quantum-blue);
}

/* ============================================
   PART 10: ARTICLE CARDS
   ============================================ */

.up-article-card {
    background: var(--anthracite);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    transition: var(--transition-base);
}

.up-article-card:hover {
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.up-article-tags {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-bottom: var(--space-md);
}

.up-article-tag {
    padding: 4px 12px;
    background: rgba(0, 212, 255, 0.1);
    color: var(--quantum-blue);
    font-size: var(--text-micro);
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.up-article-tag.open-access {
    background: rgba(16, 185, 129, 0.15);
    color: var(--plasma-green);
}

.up-article-title {
    font-family: var(--font-serif);
    font-size: var(--text-h3);
    font-weight: 600;
    color: var(--platinum);
    line-height: 1.4;
    margin-bottom: var(--space-md);
    text-decoration: none;
    display: block;
    transition: color var(--duration-fast);
}

.up-article-title:hover {
    color: var(--quantum-blue);
}

.up-article-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: var(--text-small);
    color: var(--silver);
    margin-bottom: var(--space-lg);
}

.up-article-authors {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.up-article-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--gradient-ai);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-micro);
    font-weight: 700;
    color: var(--void-black);
}

.up-article-stats {
    display: flex;
    gap: var(--space-lg);
    padding-top: var(--space-md);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.up-article-stat {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: var(--text-small);
    color: var(--silver);
}

.up-article-stat i {
    color: var(--quantum-blue);
}

/* ============================================
   PART 11: ANIMATIONS
   ============================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }

    100% {
        background-position: 200% 0;
    }
}

@keyframes glow {

    0%,
    100% {
        opacity: 0.5;
    }

    50% {
        opacity: 1;
    }
}

.up-animate-fade-in-up {
    animation: fadeInUp 0.6s var(--ease-smooth) forwards;
}

.up-animate-float {
    animation: float 3s ease-in-out infinite;
}

.up-animate-delay-1 {
    animation-delay: 0.1s;
}

.up-animate-delay-2 {
    animation-delay: 0.2s;
}

.up-animate-delay-3 {
    animation-delay: 0.3s;
}

.up-animate-delay-4 {
    animation-delay: 0.4s;
}

/* Skeleton Loading */
.up-skeleton {
    background: linear-gradient(90deg, var(--anthracite) 25%, var(--graphite) 50%, var(--anthracite) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}

/* ============================================
   PART 12: UTILITIES
   ============================================ */

.up-container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.up-section {
    padding: var(--space-3xl) 0;
}

.up-section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.up-grid {
    display: grid;
    gap: var(--space-xl);
}

.up-grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.up-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.up-grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1024px) {

    .up-grid-3,
    .up-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {

    .up-grid-2,
    .up-grid-3,
    .up-grid-4 {
        grid-template-columns: 1fr;
    }
}

.up-flex {
    display: flex;
}

.up-flex-center {
    align-items: center;
    justify-content: center;
}

.up-flex-between {
    justify-content: space-between;
}

.up-flex-wrap {
    flex-wrap: wrap;
}

.up-gap-sm {
    gap: var(--space-sm);
}

.up-gap-md {
    gap: var(--space-md);
}

.up-gap-lg {
    gap: var(--space-lg);
}

.up-text-center {
    text-align: center;
}

.up-mb-sm {
    margin-bottom: var(--space-sm);
}

.up-mb-md {
    margin-bottom: var(--space-md);
}

.up-mb-lg {
    margin-bottom: var(--space-lg);
}

.up-mb-xl {
    margin-bottom: var(--space-xl);
}

/* ============================================
   PART 13: RESPONSIVE ADJUSTMENTS
   ============================================ */

@media (max-width: 768px) {
    :root {
        --text-hero: 2.5rem;
        --text-display: 1.75rem;
        --space-xl: 1.5rem;
        --space-2xl: 2rem;
        --space-3xl: 3rem;
    }

    .up-hero {
        min-height: 80vh;
        padding: var(--space-2xl) var(--space-md);
    }

    .up-hero-stats {
        flex-direction: column;
        gap: var(--space-lg);
    }

    .up-nav-links {
        display: none;
        /* Mobile menu implementation needed */
    }
}